Clay tile roofing system installation
Clay tiles are a heavy roofing system, which does require an appropriate underlying support structure specifications. The slope of your Chicagoland roof should be no less than 4/12 (18 degrees) up to 10:12 (40 degrees). Asphalt saturated, nonperforated organic felts are among the most common underlayments; they commonly are designated as Type 15 and Type 30 or referred to as No. 15 and No. 30, which are reflective of a once used pound per square weight designation. The terms Type I and Type II now used within the roofing industry in lieu of No. 15 or No. 30, respectively.
An ice dam protection membrane should be applied starting at a roof’s eaves and extending upslope a minimum of 24 inches from the exterior wall line of a building. For slopes less than 4:12 (18 degrees), NRCA recommends a minimum of 36 inches.
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